20002120

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{7043}}^1$

素因数の和:7125

約数の個数: 32

約数和(自身を含む): 45645120

約数和(自身を除く): 25643000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 7043, 14086, 28172, 35215, 56344, 70430, 140860, 281720, 500053, 1000106, 2000212, 2500265, 4000424, 5000530, 10001060, 20002120]

約数ペア:

[(1, 20002120), (2, 10001060), (4, 5000530), (5, 4000424), (8, 2500265), (10, 2000212), (20, 1000106), (40, 500053), (71, 281720), (142, 140860), (284, 70430), (355, 56344), (568, 35215), (710, 28172), (1420, 14086), (2840, 7043)]